netdev - [PATCH 1/4] [UDP]: fix send buffer check

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Date:	Mon, 17 Dec 2007 21:38:03 -0500
From:	Hideo AOKI <haoki@...hat.com>
To:	David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev <netdev@...r.kernel.org>
CC:	Takahiro Yasui <tyasui@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Satoshi Oshima <satoshi.oshima.fk@...achi.com>,
	Bill Fink <billfink@...dspring.com>,
	Andi Kleen <andi@...stfloor.org>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	yoshfuji@...ux-ipv6.org,
	Yumiko Sugita <yumiko.sugita.yf@...achi.com>, haoki@...hat.com
Subject: [PATCH 1/4] [UDP]: fix send buffer check

This patch introduces sndbuf size check before memory allocation for
send buffer.

signed-off-by: Satoshi Oshima <satoshi.oshima.fk@...achi.com>
signed-off-by: Hideo Aoki <haoki@...hat.com>
---

 ip_output.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -pruN net-2.6/net/ipv4/ip_output.c net-2.6-udp-take11a1-p1/net/ipv4/ip_output.c
--- net-2.6/net/ipv4/ip_output.c	2007-12-11 10:54:55.000000000 -0500
+++ net-2.6-udp-take11a1-p1/net/ipv4/ip_output.c	2007-12-17 14:42:31.000000000 -0500
@@ -1004,6 +1004,11 @@ alloc_new_skb:
 					frag = &skb_shinfo(skb)->frags[i];
 				}
 			} else if (i < MAX_SKB_FRAGS) {
+				if (atomic_read(&sk->sk_wmem_alloc) + PAGE_SIZE
+				    > 2 * sk->sk_sndbuf) {
+					err = -ENOBUFS;
+					goto error;
+				}
 				if (copy > PAGE_SIZE)
 					copy = PAGE_SIZE;
 				page = alloc_pages(sk->sk_allocation, 0);
-- 
Hitachi Computer Products (America) Inc.
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